. >> reporter: one of the coldest of cold cases brought a commotion to patricia's house near detroit today. >> i was told a dead body might be buried in my backyard. >> reporter: not just any body, but that of jimmy hoffa, one-time boss of the teamsters, america's biggest union. he disappeared without a trace more than 37 years ago. a decade before patricia bought her home. >> he is the best-known dead body that they've been looking for for years. >> reporter: hoffa's connections to organized crime had spurred numerous theories about his disappearance in july of 1975. earlier this year, an informant told hoffa wars author he saw a body being buried at this suburban home around the time hoffa vanished. >> he's adamant about his beliefs hoffa is buried at this location. >> reporter: he pointed the informant to authorities. their initial check days ago with ground penetrating radar revealed something about two feet below the home's driveway. today with a crowd of onlookers, police were back to take two soil samples, digging down about six feet. >> there was no visible remains that you c